Refrigerants and cold storage? How much to add refrigerant appropriate?

freon cold storage refrigeration system add refrigerant, must assure refrigerant drying, otherwise will certainly because refrigerant refrigeration system is not dry, cause the ice cooling system, thus affecting the refrigeration system normal operation, the following detailed explain for everybody to fluorine refrigerant refrigeration system of pumping air into vacuum state, filling method, the filling amount of judgment.

a, cold storage and vacuum filling refrigerant

new refrigerator system before filling refrigerant to pumping air into vacuum state, as for the harm of pumping air into vacuum state, not our refrigeration encyclopedia public has said many times, here is not wordy. Vacuum tee first table in the compressor suction and exhaust Angle valve, open the Angle valve, open the vacuum pump vacuum. Smoking to - 0. 1MPa( 760毫米汞柱) After the stop of pumping air into vacuum state, vacuum time should be according to the size of cold storage and vacuum pump to determine the size, and according to the pressure gauge shows pressure value shall prevail.

to pay attention to the group! It is forbidden to use the compressor pumping air into vacuum state, because as refrigerating compressor casing body of vacuum degree deepens, the shell between bare terminal or insulating layer has a tiny broken lost between winding insulation, once the electricity, the motor may be short circuit burned in an instant. If shell leakage, but also may cause people get an electric shock.

vacuum is completed, ready to add refrigerant. We need to understand that the cold storage is the correct filling quantity of refrigerant decided to refrigeration system running efficiency of the key factors.

such as: cold storage refrigerant filling amount is insufficient, will lower the efficiency of inspiratory pressure and exhaust pressure, especially for back gas cooling may cause in the compressor motor overheating; Such as amount of refrigerant charging excessive, may cause the evaporator frosting, serious damage to the compressor condensing pressure is too high or evaporator liquid. Even the same refrigeration equipment, also because of internal cold storage capacity, evaporating temperature, condensing pressure is different, and different good refrigerant filling quantity.

in cold storage refrigeration system maintenance, in most cases, you can use the low voltage side filling refrigerant gas or liquid, when the refrigerant filling quantity is bigger, also can be used from the high side filling refrigerant liquid filling method. Need to pay attention! If from low voltage side filling liquid refrigerant, be sure to slow down, in order to avoid liquid! If the fear of the liquid, gas filling.

a larger pattern

from the method of low voltage side add refrigerant:

from the low voltage side filling gas refrigerant operation, low pressure tee valve first spin counterclockwise to the endpoint, then add the fluorine bottles of fluorine pipe joint in the low pressure of the 3-way valve bypass seat, then open the bottle of R22 fluorine cylinder valves, to bypass of the silk of cut-off valve nipple let a little, will add fluoride tube R22 gas out of the air, after hearing a joint 'hissing, hissing noise of air lock immediately, refrigerant charging.

when injection after reaching the quality of the rules, close the fluorine bottle of cut-off valve, low pressure tee valve according to spin counterclockwise to the endpoint, close the R22 fluorine bottles of cylinder valves, remove the fluoridated tube, add fluoride work over.

2, the judgment of refrigerator filled volume of the refrigerant

for sure one of the commonly used method of refrigerator filled volume of the refrigerant, is the observation for the pipeline in fluid pipe, depending on the flow of liquid refrigerant in the mirror.

when liquid flow can be clearly seen, can think refrigerant has correct filling, if there is a bubble, often shows lack of refrigerant, but it could be depending on the liquid mirror the liquid pipe scaling part or the condensing pressure of rapid change, the refrigerant pressure drop. So depending on the liquid lens can be used as an effective but determine the amount of refrigerant charging method, is not a basis.

of course, can also according to the operation condition of the system is running a judgment, the adjustment of the first expansion valve lever must be set in the middle position, that is to keep the factory status ( Expansion valve generally not adjusted) 。 Then add liquid to low pressure is akin to the evaporation temperature refrigerator ( Lower than the base temperature 5 ~ 8 degrees) The corresponding pressure shall prevail. Experienced technicians, can also according to the outlet air temperature of air cooling condenser, compressor gas condensation or frost, current, expansion valve, frost situation to judge.

a larger pattern

refrigerator filling refrigerant operation principle: library temperature above 0 degrees, any part of the system are not allowed to have frost phenomenon appear! Only library temperature below zero, began to frost's expansion valve outlet pipe, and then gradually extended to the evaporator, is back after trachea, until the inspiratory Angle valve in the compressor.

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